Current-amplifying apparatus and circuits.



. H. 3. SHREEVE;

' CURRENT AMPLIFYING APPARATUS AND CIRCUITS.

APPLICATION FILED AUG. 20, 1912 1 ,093,888. Patented Apr. .21, 19m

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APPLICATION FILED AUG. 20, 1912.

- Patented Apr. 21, 1914.

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UNITED STATES FATENT OFFICE.

I HERBERT E. SHREEVE, OF MILBI T RN, NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, OF NEW YORK, N. Y., A CORPORATION OF ILLINOIS.

CURRENT-AMPLIFYING APPARATUS AND CIRCUITS.

Specification of Letters Patent.

Patented Apr. 21, 1914.

Application filed August 20, 1912. Serial No. 715,967.

To all whom it may concern Be it known that I, HERBERT E. Sn'nnnvn, subject of the King of Great Britain, residing at Milburn, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Ourrent-Amplifying Apparatus and Circuits, of which the following is a full, clear, concise, and exact description.

This invention relates to signaling apparatus for amplifying current impulses and more particularly to repeater apparatus for amplifying wireless signals.

One of the objects of this invention is to provide a repeater for this purpose of few and simple parts easily and rapidly adjust able to meet widely varying conditions. To meet these requirements there is provided a repeater comprising. generallya base and a container containing an electromagnetic receiving element having an adjustable pole operated by means carried by the base and a removable microphonic element supported by said container in operative relation to the receiver element and in position to be engaged 'by a pivotally supported retaining. and contact element.

Another object of this invention is to provide apparatus in connection with the repeater and the circuit with which it is connected for determining the most sensitive adjustment of the device, and is attained by the provision of a magneto generator of such design and construction that it may be permanently included in circuit with the repeating element without appreciably affecting theoperation of this element.

In the drawings illustrating this invention Fi ure 1, is a sectional view of a repeater emiodying this invention, Fig. 2 is a bottom 'view of the repeater with parts removed, Fig. 8 is a detail View of the parts of the microphonic element of the repeater, Fig. 4 is a detail view of the receiving and ad usting parts of the repeater, Fig. 5 is a perspective view of the shell or frame of the repeater and Fig. 6 is a diagram of the apparatus and connections of'the invention applied to a wireless system showing schematically the apparatus of the testing device.

Referring now to the drawings the frame or shell of the repeater comprises a hollow cylindrical base 5 having formed integrally therewith a container 6 the bore of which is enlarged at the upper end as indicated at 7 to receive the microphone element of the repeater as will hereinafter more fully appear. Secured within the smaller diameter of the container 6 by means of a set screw 8 is a tube 9 of magnetic material. Secured within this tube 9 by means of a set screw 10 is a non-magnetic bobbin 11 having an energizing winding 12 located at one end thereof and being in engagement at its other end with a block 13 of magnetic material secured by means of screws 14:, 1 1 to the tube 9. An adjustable pole 18 of magnetic material having a screw threaded portion 19 engaging a screw threaded opening in the block 13 extends into the bobbin 11 and is provided on its lower end with a squared portion 20. This squared portion 20 engages a'corresponding opening 21 in a gear 25 rotatably supported between a bracket 26 and a-bottom plate 27 which is secured in a recessed portion 28 of the cylindrical base 5. Meshing with the gear 25 is a pinion 30 secured to a stud 31 which passes through the upper wall of the base 5 and has secured to the upper end thereof a knurled thumb nut 32. 30 Mountedupon the top portion of the base 5 are connecting posts or screws 35, 36, 37,

38 and 39, the post 35 being in electrical connecti'on with the base 5 the others being insulated therefrom. Conductors 4:0, 40 led 35 through a lined opening in the block 13 and the bobbin 11 are connected with the terminals of the winding 12 and the binding posts 38 and 39. The binding posts 36 and 37 are strapped together. by means of a conduc- 9 tor 41.

The microphonic element of the repeater isv so constructed that it may be easily removable from the container 6, the purpose being to provide-for the insertion of microphonic 5 elements having diaphragms of different natural periods. Referring now to the microphonic element, 50 designates a support ng member having a knurled rim 51-rest1ng upon the upper end of the container 6 and with a cup portion 52 projecting into the enlarged portion 7 of the container 6 and having exterior screw threads. Secured to the lower end of this cup by means of a clamping ring 53 engaging the exterior threads thereof is a metallic electrodeor diaphragm 54 preferably formed of magnet c material and gold plated. Secured to thls diaphragm 54 is a magnetic stud or 'lunger 55 which extends into the bobbin l l'1nto po- 1;; a

sition to be acted upon by the magnetism caused by the energization of the winding 12. The interior of the cup 52 is provided with an insulating lining 56 which is secured therein by means of a metallic stud 57 having a flat portion engaging said lining 56 and a screw threaded portion extending through a clearance hole 59 in the supporting member 50, and receiving a fastening nut 60 which is insulated from the member 50 by means of an insulating washer 61.

Secured to the metallic stud 57 is'a hollow conical electrode having an upturned edge 66 and arranged to dip into comminuted material 67 contained by said cup and resting upon the metal diaphragm 54.

The upper end of the metallic stud 57 projects beyond the supporting member 50 into engagement with a spring contact 70 pivotally supported upon the upper end of a post 71, forming a portion of the connecting screw or post 37 it is quite obvious from the foregoing description that the turning of the knurled thumb nut 32 in a iven direction will advance or retract the pole 18 toward or away.

winding 76 being connected with the antenna the other to ground through a variable condenser 78. The winding 77 has one terminal connected directly with one terminal of an auto-transformer 7 9, the other terminal of said winding 77 being connected with the other terminal of said. auto-transformer through a variable resistance 80 and a condenser 81. A cell 82 is connected in multiple with the variable resistance 80. A de-.

tector 83 is connected in parallel with the winding 77 of the loose coupled tuning coil and the autotransformer 79. The opposite side of thcauto-transformer is connected through switch contacts 84 and 85 conductors, 86, 87, 88 and 89 with the binding posts 88 and 39, and thus with the energizing winding 12 of the repeater. ,A doublereceiver 90 such as is used for receiving wireless signals is connected by means of switch contacts 91 and 92 and conductors 93 and 94 with the secondary 95 of an induction coil 96. The primary 97 of this induction coil is connected in series with a battery 98 and the microph onic element of the repeater through the binding post 85 and 86. The secondary 95 of the induction coil 96 is preferably made adjustable so that the repeater may be made to work with either a high or a low impedance receiver.

The means. provided for testing the repeater for adjustment is as follows: A small magneto generator comprising a permanent magnet lOl and windings 102 and 103 connected with the conductors 88 and 89 leading to the binding posts 38 and 39 ofthe repeater has located in front of the magnet 101 a steel reed 105 which may be caused to vibrate by striking it with the finger. The vibration of the reed 105 in front of the permanent magnet will induce an alternating current in the windings 102 and 103which will operate the repeater while the adjusting screw-32 is being turned. The coils of the magneto gonerator are wound to a high resistance to prevent any appreciable shunting effect on the receiving element of the repeater.

Although intended to be placed in an u right position as shown in the drawing t e repeaterwill operate satisfactorily in any position. The magneto generator is shown as mounted in a box containing the induction coil 96 and although this is a very convenient arrangement provision may be made for mounting it upon the repeater structure or other suitable place.

What I claim is:

1. In a repeater for amplifying current impulses a supporting frame comprising a base and an integrally formed container thereon, a receiving element carried within said container, a microphonic element removably carried by said container in operative relation to said receiving element, and combined contact and retaining means for said microphonio element supported by said base. v

2. In a repeater for amplifying current impulses a supportin frame comprising a base and an integra ly formed container thereon a receiving element carried within said container, a microphonic element removably carried by said container ln operative relation to said receiver element, 'a combined contact and retaining device having one end in engagement with said microphonic element, and supporting means for said contact and retaining device secured to said base.

3. In a repeatenfor amplifying current impulses a supporting frame comprising a. base and an integrally formed container, 9. receiving element carried within said container, .a microphonic element removably mounted in the upper, end of said container inoperative relation to said receiver element, a rotatably mounted contact and retaining means for said microphone element, and a connecting post, secured. to said base and supporting means.

said contact-and retaining,

4. In a repeater for amplifying current impulses a frame comprising a base and a container carried thereby said container having an enlarged bore at its upper end, a receiver element located in said container, a unitary microphonic element removably supported in the enlarged portion of said con-. tamer in o erative relation to said receiver element, and a combined contact and retaining device for said microphonic element pivotally supported adjacent to said container. 5. In a repeater for amplifying current impulses a frame comprising a base and a container carried thereby, a microphonic element carried by said container, a receiver element located in said container in operative relation to said microphonic element, an adjustable pole for said receiver, and adjustin means for said receiver pole located in sai base. 6. In arepeater for amplifying current impulses a frame comprising a base and a container carried thereby, a microphonic element carried by said container, av receiver element located in said container in operative relation, to-said microphonic element, a

, rotatably adjustable pole for said receiving element, an adjusting device carried by said base, and operative connections between said adjusting device and said adjustable pole.

7. In a repeater for amplifying current impulses a frame comprising a hollow base and a container carried thereby, a microphonic element carried by said container, a receiver element located in said container in operative relation to. said microphonic ele ment, arotatablyadjustable pole for said receiver, gears located in said base and connected' with said adjustable pole piece, and adjusting means mounted upon said base and connected with said gears.

8. In an apparatus for amplifying-ourrent impulses, 1n combination a microphone element and a receiver element in adjustable operative relation, a signal-receiving circuit includingsaid receiver element, and means for determining the adjustment of said amplifying apparatus included permanently in circuit with said receiver element and said signal-receiving circuit.

9. In an apparatus for v amplifying current impulses, in combination a microphone element and a receiver element in adjustable operative rel'ation, a signal-receivin clrcuit including said receiver element, an

a high-resistance magneto-generator having its winding connected permanently in air cuit'with said receiver element an in parallel in said signal-receiving circuit.

In witness whereof, I hereunto subscribe my name this 19th day of August, A. D.,

HERBERT E. SH REEVE. Witnesses:

ELLA EDLER, WAL'I'ER Fnnonnron HOFFMAN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 01 Patents,-

Waahington, D. 0. 

